Doc: update readme with examples
Doc: update readme with examples

There's now a large IRB session with annotated comments, which shows off
everything the gem has to offer at the moment. It also underscores two
points that can be improved:

* Automatic tokenization (tokenize input Strings when Arrays are expected)
* Persistence (to be solved soon-ish when I need it for Infinity Feed)

Narnach/groupie,Narnach/groupie